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PHP

<?php
/**
* Class Meta_Sanitizer.
*
* @link https://github.com/googleforcreators/web-stories-wp
*
* @copyright 2020 Google LLC
* @license https://www.apache.org/licenses/LICENSE-2.0 Apache License 2.0
*/
/**
* Copyright 2020 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
declare(strict_types = 1);
namespace Google\Web_Stories\AMP;
use Google\Web_Stories_Dependencies\AMP_Meta_Sanitizer;
use Google\Web_Stories_Dependencies\AmpProject\Html\Attribute;
use Google\Web_Stories_Dependencies\AmpProject\Html\Tag;
/**
* Meta sanitizer.
*
* Sanitizes meta tags found in the header.
*
* This version avoids using amp_get_boilerplate_stylesheets().
*
* @since 1.1.0
*
* @see amp_get_boilerplate_stylesheets()
* @see AMP_Meta_Sanitizer
*/
class Meta_Sanitizer extends AMP_Meta_Sanitizer {
/**
* Always ensure we have a style[amp-boilerplate] and a noscript>style[amp-boilerplate].
*
* The AMP boilerplate ({@link https://amp.dev/documentation/guides-and-tutorials/stories/learn/spec/amp-boilerplate}) styles should appear at the end of the head:
* "Finally, specify the AMP boilerplate code. By putting the boilerplate code last, it prevents custom styles from
* accidentally overriding the boilerplate css rules."
*
* @SuppressWarnings(PHPMD.NPathComplexity)
*
* @since 1.1.0
*
* @link https://amp.dev/documentation/guides-and-tutorials/optimize-and-measure/optimize_amp/#optimize-the-amp-runtime-loading
*/
protected function ensure_boilerplate_is_present(): void {
$style = null;
$styles = $this->dom->xpath->query( './style[ @amp-boilerplate ]', $this->dom->head );
if ( $styles ) {
$style = $styles->item( 0 );
}
if ( ! $style ) {
$style = $this->dom->createElement( Tag::STYLE );
if ( $style ) {
$style->setAttribute( Attribute::AMP_BOILERPLATE, '' );
$style->appendChild( $this->dom->createTextNode( $this->get_boilerplate_stylesheets()[0] ) );
}
} elseif ( $style->parentNode ) {
$style->parentNode->removeChild( $style ); // So we can move it.
}
if ( $style ) {
$this->dom->head->appendChild( $style );
}
$noscript = null;
$noscripts = $this->dom->xpath->query( './noscript[ style[ @amp-boilerplate ] ]', $this->dom->head );
if ( $noscripts ) {
$noscript = $noscripts->item( 0 );
}
if ( ! $noscript ) {
$noscript = $this->dom->createElement( Tag::NOSCRIPT );
$style = $this->dom->createElement( Tag::STYLE );
if ( $style && $noscript ) {
$style->setAttribute( Attribute::AMP_BOILERPLATE, '' );
$style->appendChild( $this->dom->createTextNode( $this->get_boilerplate_stylesheets()[1] ) );
$noscript->appendChild( $style );
}
} elseif ( $noscript->parentNode ) {
$noscript->parentNode->removeChild( $noscript ); // So we can move it.
}
if ( $noscript ) {
$this->dom->head->appendChild( $noscript );
}
}
/**
* Get AMP boilerplate stylesheets.
*
* Clone of amp_get_boilerplate_stylesheets().
*
* @since 1.1.0
*
* @link https://www.ampproject.org/docs/reference/spec#boilerplate
* @see amp_get_boilerplate_stylesheets()
*
* @return string[] Stylesheets, where first is contained in style[amp-boilerplate] and the second in noscript>style[amp-boilerplate].
*/
protected function get_boilerplate_stylesheets(): array {
return [
'body{-webkit-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-moz-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-ms-animation:-amp-start 8s steps(1,end) 0s 1 normal both;animation:-amp-start 8s steps(1,end) 0s 1 normal both}@-webkit-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-moz-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-ms-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-o-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}',
'body{-webkit-animation:none;-moz-animation:none;-ms-animation:none;animation:none}',
];
}
}